US 11,807,748 B2
Internally plasticized polyvinyl chloride and a process for preparation thereof
Virendra Kumar Gupta, Mumbai (IN); Saurabh Kumar Tiwari, Amethi (IN); Ashok Misra, Bangalore (IN); and Haribhau Shantaram Kumbhar, Jalgaon (IN)
Assigned to RELIANCE INDUSTRIES LIMITED, Mumbai (IN)
Appl. No. 17/425,460
Filed by RELIANCE INDUSTRIES LIMITED, Mumbai (IN)
PCT Filed Jan. 24, 2020, PCT No. PCT/IB2020/050560
§ 371(c)(1), (2) Date Jul. 23, 2021,
PCT Pub. No. WO2020/152637, PCT Pub. Date Jul. 30, 2020.
Claims priority of application No. 201821027921 (IN), filed on Jan. 25, 2019.
Prior Publication US 2022/0098396 A1, Mar. 31, 2022
Int. Cl. C08L 27/06 (2006.01); C08F 220/18 (2006.01); C08F 212/08 (2006.01); C08F 218/08 (2006.01); C08F 220/44 (2006.01); C08F 222/06 (2006.01); C08F 222/26 (2006.01); C08K 5/00 (2006.01); C08K 5/04 (2006.01); C08K 5/315 (2006.01); C08K 5/14 (2006.01)
CPC C08L 27/06 (2013.01) [C08F 212/08 (2013.01); C08F 218/08 (2013.01); C08F 220/1804 (2020.02); C08F 220/44 (2013.01); C08F 222/06 (2013.01); C08F 222/26 (2013.01); C08K 5/0016 (2013.01); C08K 5/14 (2013.01); C08K 5/315 (2013.01); C08L 2203/16 (2013.01); C08L 2203/18 (2013.01); C08L 2207/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A process for preparing an internally plasticized poly vinyl chloride resin, said process comprising the following steps:
(i) treating thermally a polyvinyl chloride (PVC) resin to allow partial dehydrochlorination to obtain partially unsaturated polyvinyl chloride resin;
(ii) mixing the partially unsaturated polyvinyl chloride resin with a fluid medium to obtain a slurry, wherein said fluid medium is at least one selected from the group consisting of 1-propanol, 2-propanol, 1-butanol, 1-pentanol and ethylene glycol;
(iii) heating the slurry at a temperature in the range of 70° C. to 120° C. to obtain heated slurry;
(iv) adding at least one initiator and at least one plasticizer, under stirring, to the heated slurry to obtain a reaction mixture, wherein said plasticizer comprises allyl group, vinyl group or combination thereof;
(v) maintaining the reaction mixture at a temperature in the range of 100° C. to 130° C., under stirring, for a time period in the range of 4 to 10 hours to obtain a product mixture comprising the internally plasticized polyvinyl chloride resin;
(vi) filtering the product mixture to obtain the internally plasticized polyvinyl chloride resin: and
wherein the PVC resin has a chlorine content in the range of 56 wt % to 59 wt %, and the partially unsaturated PVC resin obtained after step (i) of thermal treatment has chlorine in the range of 48 wt % to 55 wt %.